"American Express® App
You can quickly and easily unlock your PIN on the Amex App. Simply go to the 'Account' tab and then select 'Manage Card PIN'. Tap 'Unlock PIN' and answer the security questions. Once completed, you can view or change your PIN if you need a reminder or want to change it to something more memorable. Watch how here.
First log in to your Online Account and select ‘Account Management’. Then go to ‘View PIN’ and answer the security questions. A banner will display at the top of the screen confirming your PIN is locked. Click the ‘Unlock PIN’ button and your PIN will be unlocked at your next Chip & PIN transaction."